| We test the electroweak sector of the Standard Model of particle physics through the measurements of the cross section of the simultaneous production of the neutral weak boson Z and photon gamma, and the limits on the anomalous Zgammagamma and ZZgamma triple gauge couplings h 3 and h4 with the Z decaying to leptons (electrons and muons). We analyze events collected in proton-proton collisions at center of mass energy of s = 7 TeV corresponding to an integrated luminosity of 5.0 inverse femtobarn. The analyzed events were recorded by the Compact Muon Solenoid detector at the Large Hadron Collider in 2011.;The production cross section has been measured for hard photons with transverse momentum greater than 15 GeV that are separated from the the final state leptons in the eta-&phis; plane by DeltaR > 0.7, whose sum of the transverse energy of hadrons over the transverse energy of the photon in a cone around the photon with DeltaR < 0.3 is less than 0.5, and with the invariant mass of the dilepton system greater than 50 GeV. The measured cross section value is 5.33 +/- 0.08 (stat.) +/- 0.25 (syst.) +/- 0.12 (lumi.) picobarn. This is compatible with the Standard Model prediction that includes next-to-leading-order QCD contributions: 5.45 +/- 0.27 picobarn.;The measured 95 % confidence-level upper limits on the absolute values of the anomalous couplings h3 and h 4 are 0.01 and 8.8E-5 for the Zgammagamma interactions, and, 8.6E-3 and 8.0E-5 for the ZZgamma interactions. These values are also compatible with the Standard Model where they vanish in the tree-level approximation. They extend the sensitivity of the 2012 results from the ATLAS collaboration based on 1.02 inverse femtobarn of data by a factor of 2.4 to 3.1. |
